﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NiuX.Domain.Entities
{
    public abstract class ValueObject
    {
        protected static bool EqualOperator(ValueObject left, ValueObject right)
        {
            if (left is null ^ right is null)
            {
                return false;
            }
            return left is null || left.Equals(right);
        }

        protected static bool NotEqualOperator(ValueObject left, ValueObject right)
        {
            return !EqualOperator(left, right);
        }

        protected abstract IEnumerable<object> GetEqualityComponents();

        public override bool Equals(object? obj)
        {
            if (obj == null || obj.GetType() != GetType())
            {
                return false;
            }

            var other = (ValueObject)obj;

            return GetEqualityComponents().SequenceEqual(other.GetEqualityComponents());
        }

        public override int GetHashCode()
        {
            var a = 1;
            
            return GetEqualityComponents().Select(x => x != null ? x.GetHashCode() : 0).Aggregate((x, y) => x ^ y);
        }

        public ValueObject? GetCopy()
        {
            return MemberwiseClone() as ValueObject;
        }
    }
}
